- That zone has a lot of outdoor air (.44 m3/s). Is the outdoor air alone maintaining the setpoint? (Not sure of your climate)
- Is the people schedule for that zone always 0? (I know that no zone is considered "occupied" unless people are present and that may also affect peak load calculations)
- Does the zone have equipment and lighting? If so, is it operating and causing cooling load?
- Is there exposure to the outdoors via walls or roof? (which also cause cooling load)
Hello, as for the â??Zone Sensible Heatingâ?? for the highlighted zone the â??Calculated Design Load [W]â?? is equal to 0 although the â??Thermostat Setpoint Temperature at Peak Loadâ?? (24°C) is not met (I have attached an image where you can see part of the html report). The zone is served by a VAV system that supplies many zones. There is a local reheat coil, whose power is autosized equal to 0 and therefore the zone setpoint temperature is not met.
What I consider really strange is that other zones are served by the same VAV system and have the same parameters for Sizing:zone but their â??Calculated Design Load [W]â?? is greater than 0 (e.g. 00:SPOGLIATOIOFEMMINILE).
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Sizing:Zone,
   00:SpogliatoioMaschile, !- Zone or ZoneList Name
   TemperatureDifference,  !- Zone Cooling Design Supply Air Temperature Input Method
   12.22,                  !- Zone Cooling Design Supply Air Temperature {C}
   11.11,                  !- Zone Cooling Design Supply Air Temperature Difference {deltaC}
   TemperatureDifference,  !- Zone Heating Design Supply Air Temperature Input Method
   35,                     !- Zone Heating Design Supply Air Temperature {C}
   11.11,                  !- Zone Heating Design Supply Air Temperature Difference {deltaC}
   0.0090,                 !- Zone Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
   0.0040,                 !- Zone Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
   00:SpogliatoioMaschile Design Specification Outdoor Air Object, !- Design Specification Outdoor Air Object Name
   1.25,                   !- Zone Heating Sizing Factor
   1.15,                   !- Zone Cooling Sizing Factor
   DesignDay,              !- Cooling Design Air Flow Method
   0.000000,               !- Cooling Design Air Flow Rate {m3/s}
   0.000760,               !- Cooling Minimum Air Flow per Zone Floor Area {m3/s-m2}
   0.000000,               !- Cooling Minimum Air Flow {m3/s}
   0.00,                   !- Cooling Minimum Air Flow Fraction
   DesignDay,              !- Heating Design Air Flow Method
   0.000000,               !- Heating Design Air Flow Rate {m3/s}
   0.002030,               !- Heating Maximum Air Flow per Zone Floor Area {m3/s-m2}
   0.141580,               !- Heating Maximum Air Flow {m3/s}
   0.30,                   !- Heating Maximum Air Flow Fraction
   00:SpogliatoioMaschile Design Specification Zone Air Distribution Object; !- Design Specification Zone Air Distribution Object Name
Â
DesignSpecification:OutdoorAir
,    00:SpogliatoioMaschile Design Specification Outdoor Air Object, !- Name
   Flow/Zone,              !- Outdoor Air Method
   ,                       !- Outdoor Air Flow per Person {m3/s-person}
   0.000000,               !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}
   0.44,                   !- Outdoor Air Flow per Zone {m3/s}
   0.000000,               !- Outdoor Air Flow Air Changes per Hour {1/hr}
   occupazione;            !- Outdoor Air Schedule Name
Â
Best Regards
Francesco
--James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504
Direct / Mobile: 616.450.8653
jim@buildingperformanceteam.com
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